It can be, but heat adds intensity. Start with regular-temperature classes if you have heart or heat-sensitivity concerns.
Beginners Yoga: How to do Balasana - Child's Pose
Hot yoga (90–105°F) increases sweat and flexibility but also dehydration risk. Beginners should hydrate well, listen closely to their body, and leave the room if dizzy. Get medical clearance if you have cardiovascular conditions.